Yale offers cylindrical and tubular options in medium duty door knobs. These door knobs provide ANSI grade 3 standard, offering a durable and economical door lock solution with classic designs that suit both residential projects and light duty commercial buildings. Standard: ANSI / BHMA A156.2.2003 Grade 3. Testing Cycles: 200,000 cycles tested. Function: Residental and light duty commercial or institutional use Cylinder: Solid Brass 5-pin tumbler cylinder No. of Keys: 3 pcs of nickel plated brass key Master key available upon request Finish Code: Polished Brass (US3), Antique Brass (US5), Antique Copper (US11), Satin Nickel (US15), Satin Stainless Steel (US32D)